Improvement in hoisting-machines



UNITED STATES PATENT OFFICE.

SAMUEL M. LONGLEY, OF HUDSON CITY, NEW YORK.

IMPROVEMENT IN HISTING-MACHINES.

Specification forming part of Letters Patent No. 411,779, dated March 1, 1864.

To all whom t may concern:

Be it known that I, SAMUEL M. LONGLEY, of Hudson, of Columbia county, in the State ot' New York, have invented certain new and useful Improvements in Hoisting-Machines 5 and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making part of this application.

My invention relates to an improved apparatus or machine for hoisting, and has for its object to provide a combination of mechanical devices which shall constitute a machine better adapted to the economical application of power for lifting heavy weights than any now known, and one which shall be simple and capable of being readily employed under varying` circumstances 5 and to these ends my invention consists in the employment, in combination with two chainwheels, or their equivalents, of diii'erent diameters and a chain of a system of gearing, substantially as hereinafter fully described.

To enable those skilled in the art to make and use my invention, I will now proceed to describe the construction and operation of one of my improved machines, referring by letters to the accompanying drawings, formpart of this application, ard in which- Figure l is a side elevation of my improved hoisting-machine, and Fig. 2 is an edge View of the same.

Similar letters indicate similar parts in the different iigures. 4

A is the frame of the machine, in which are mounted two shafts, a and b. one of which, a,

I make fast in the frame A, the other, l), to turn in bearings formed in said frame. On the shaft a. are hung, so as to-turn freely, two chain-wheels, c d, of ordinary construction, and adapted to receive in their peripheries the links of a chain, I3, and on said shaft a is also hung a gear, O. rEhe gear C and chainwheels c, d I propose to make all in one piece or solid, and the whole to turn freely on shaft a.. On the shaft b are keyed (inside of the frame A) a pinion, D, and (outside of said frame) a rope-wheel, E. into and drives the gear O, which carries with it the double chain-wheel c d. The chain B passes over the pulley c, thence down and rlhe pinion D meshes of which is to shorten the amount of chain 4requisite to lift a given distance.

The wheel E is provided with a rope, G, which is of the proper size to tit into the forked ends of the arms of said wheel, and

,of a suitable length to operate the machine where it may be located. It will be understood that,- if a weight be attached to the block F and power applied to rope Gr to pull the latter in the direction indicated by the arrow, the pinion D will drive the gear C, which, carrying with it the double chainwheel c d, will ca-use the chain to move as indicated by arrows; but since the diameter of the portion c is greater than that of d, it follows that the chain B will be taken up by c faster than it is let out (or down) by d, the consequence ot' which is the elevation of block F, (carrying the weight to be raised,) and it is clear that at each revolution of the chainwheels c d the block F will be elevated a distance equal to the difference between the circumferences of c and d.

It will be seen that thus a very simple and effective hoistingmachine is produced.

I do not wish to limit myself to the precise form shown of any of the parts in carrying out my invention. The gears D and O may be varied in proportions to change the speed of the machine to adapt it to different kinds of work.

I do not claim any ot the elements of the machine, as they are each and all, as elements, very old and well known; but

What I do claim as new, and desire to sccure by Letters Patent, is v The employment of the double chain-wheel o d with a chain, B, in combination with a system of gearing', O D, and a suitable powerwheel, E, substantially as and for the purposes described.

SAMUEL M. LONGLEY.

Witnesses:

ANDREW I. TODD, J. N. MCINTIRE. 

